Johnsburg, Illinois Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Johnsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain64%0.68″83°67°—
- SundayJul 5Overcast14%—81°64°-2°
- MondayJul 6Overcast——77°60°-4°
- TuesdayJul 7Overcast——80°57°+3°
- WednesdayJul 8Overcast26%—81°60°+1°
- ThursdayJul 9Drizzle30%0.05″77°64°-4°
- FridayJul 10Overcast26%—78°61°+1°
AQI 31 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~77%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 9 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~77%) — afternoon ozone should stay flat.
- Present
- AQI 34
- UV peak
- 2.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 5
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:51 PM
- Moonset
- 9:56 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Johnsburg at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 30 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Johnsburg
- Sat82°68°64%
- Sun81°64°14%
- Mon77°60°1%
- Tue80°57°2%
- Wed81°60°26%
- Thu77°64°30%
- Fri78°61°26%
- Sat82°60°12%
- Sun66°58°11%
- Mon74°55°8%
- Tue76°59°8%
- Wed80°63°26%
- Thu83°65°16%
- Fri84°68°16%
- Sat86°69°20%
- Sun86°69°29%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Johnsburg
SPC includes Johnsburg in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Johnsburg
- 60051